/**
 * 
 */
package com.etc.controller.kaptcha;

import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;

/**
 * @author Administrator
 *
 */
@Controller
@RequestMapping("/kaptcha/*")  
public class CaptchaController {
	 @Autowired  
	    private Producer captchaProducer = null;  
	   
	    @RequestMapping
	    public ModelAndView getKaptchaImage(HttpServletRequest request, HttpServletResponse response) throws Exception {  
	        HttpSession session = request.getSession();  
	        String code = (String)session.getAttribute(Constants.KAPTCHA_SESSION_KEY);  
	        System.out.println("验证码: " + code );  
	           
	        response.setDateHeader("Expires", 0);  
	        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");  
	        response.addHeader("Cache-Control", "post-check=0, pre-check=0");  
	        response.setHeader("Pragma", "no-cache");  
	        response.setContentType("image/jpeg");  
	         
	        String capText = captchaProducer.createText();  
	        session.setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);  
	         
	        BufferedImage bi = captchaProducer.createImage(capText);  
	        ServletOutputStream out = response.getOutputStream();  
	        ImageIO.write(bi, "jpg", out);  
	        try {  
	            out.flush();  
	        } finally {  
	            out.close();  
	        }  
	        return null;  
	    }  
}
